from The Century Dictionary and Cyclopedia

Etymologies

useful +‎ -ly (Wiktionary)

Examples

Those who enjoy the show inhabit that world, and presumably wish to continue living there, and thus the mockery of its manifestations and assumptions remain usefully "corrective," reminding them that it can all be quite ridiculous.

A second reason for the shortfall in our nation’s intellectual resources is what Thomson, as good a guide as one could have along the march to folly, called “the effectiveness trap,” a phrase that usefully defines the reluctance to depart further from the mainstream of discussion than is considered appropriate.

The sum of £113 million, you see - even if shared among a small syndicate - isn't the kind of usefully sensible amount that could pay for a kitchen extension or a nice car: it's a proper, gigantic explosion of silly money, catapulting its gob-smacked winner or winners into the rarefied world of the international super-rich.

Despite a certain patness in the structure (Helen's father learns to be easier on his son as he is learning to be harder on his daughter; Annie's own damaged heart opens in concert with Helen's ability to interact usefully with the world), it's a lovely play, well-written, well-woven, a little sentimental, but not excessively so.